Piston & Ring Kit – Fits Johnson/Evinrude 18-35 HP Cross Flow (Replaces 5006657, 0391056, 0392621)
Piston & Ring Kit – Fits Johnson/Evinrude 18-35 HP Cross Flow (Replaces 5006657, 0391056, 0392621) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Piston & Ring Kit – Fits Johnson/Evinrude 18-35 HP Cross Flow (...
Product Details
This Piston & Ring Kit – Fits Johnson/Evinrude 18-35 HP Cross Flow is a high-quality replacement for 2-stroke Johnson/Evinrude 18-35 HP Cross Flow engines manufactured between 1981 and 2005. It provides a reliable solution for engine rebuilds and repairs, ensuring proper fit and function.
The kit serves as a direct cross-reference for Johnson/Evinrude part numbers 5006657, 0391056, and 0392621, among other aftermarket equivalents like Sierra 18-4107 and Wiseco 3127PS.
- Engineered for internal engine installation.
- Constructed from a durable Cast Aluminum Alloy.
- Specifically designed for Cross Flow 2-Cylinder engine configurations.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 5006657 |
| Johnson/Evinrude | 0391056 |
| Johnson/Evinrude | 0392621 |
| Johnson/Evinrude | 0778488 |
| Johnson/Evinrude | 0390679 |
| Johnson/Evinrude | 0392910 |
| Johnson/Evinrude | 0396576 |
| Johnson/Evinrude | 5006664 |
| Sierra | 18-4107 |
| Mallory | 9-53412 |
| GLM | 23910 |
| Wiseco | 3127PS |
| Wiseco | 3027PS |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This piston kit is designed for a range of Johnson and Evinrude Cross Flow engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Cross Flow | 18 | 2-Stroke | 1995–1999 | 5006657 | 2 Cylinder, 3.000 Bore |
| Johnson/Evinrude | Cross Flow | 20 | 2-Stroke | 1981–1983, 1985–1997 | 5006657 | 2 Cylinder, 3.000 Bore |
| Johnson/Evinrude | Cross Flow | 25 | 2-Stroke | 1981–2005 | 5006657 | 2 Cylinder, 3.000 Bore |
| Johnson/Evinrude | Cross Flow | 28 | 2-Stroke | 1986–1989 | 5006657 | 2 Cylinder, 3.000 Bore |
| Johnson/Evinrude | Cross Flow | 30 | 2-Stroke | 1984–2005 | 5006657 | 2 Cylinder, 3.000 Bore |
| Johnson/Evinrude | Cross Flow | 35 | 2-Stroke | 1981–1984 | 5006657 | 2 Cylinder, 3.000 Bore with 3/4" Wrist Pin |
| Johnson/Evinrude | Jet | 18 | 2-Stroke | 1995–2000 | 5006657 | Per Offshore Marine listing |
Technical Specs
- Product Type
- Piston & Ring Kit
- Installation
- Engine Internal
- Bore Size
- 3.000 inch (76.2 mm) - Standard
- Material
- Cast Aluminum Alloy
- Wrist Pin Diameter
- 3/4 inch (19.05 mm)
- Dimensions
- 4.25 in x 4.25 in x 4.25 in
- Weight
- 1.22 lb (0.553 kg)
- Warranty
- 1 Year Manufacturer's Warranty
- Other Technical Attributes
- Cross Flow 2-Cylinder Design
What’s in the Box
- 1 x Piston
- 1 x Set of Piston Rings
- 1 x Wrist Pin
- 2 x Retaining Clips
Installation Notes
- Thoroughly clean the cylinder bore, removing all carbon deposits and debris.
- Verify the cylinder is within service limits and hone if necessary for proper ring seating.
- Install the rings onto the new piston, ensuring correct orientation (typically marked with a dot or letter facing up).
- Lubricate the piston, rings, and cylinder wall with fresh 2-stroke engine oil.
- Install one retaining clip on the piston before inserting the wrist pin.
- Use a ring compressor to carefully guide the piston into the cylinder.
- Align the connecting rod, insert the wrist pin, and secure it with the second retaining clip.
- Reassemble the engine according to the manufacturer's service manual, paying close attention to torque specifications.
Troubleshooting & FAQ
How do I know if this piston kit will fit my engine?
The best way to confirm fitment is to check your engine's model, horsepower, and year against the compatibility table. Cross-referencing your old part number with our Part Number Matrix is also a reliable method.
What are the signs of a worn or failed piston?
Common symptoms include low compression, excessive smoke from the exhaust, a rattling or knocking noise from the engine, and a noticeable loss of power. A visual inspection may show scoring on the piston skirt or damaged rings.
Do I need a special tool to install piston rings?
While rings can sometimes be installed by hand, using a piston ring expander tool is highly recommended to prevent bending or breaking them. A piston ring compressor is also essential for safely inserting the piston into the cylinder.
Are oversized versions of this piston kit available?
This listing is for the standard bore size. Aftermarket manufacturers often produce oversize pistons (e.g., .020", .030" over) for cylinders that have been bored out. Please check our other listings or contact us to inquire about availability.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency and quality.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most destinations; expedited options will appear at checkout where available.
Warranty & returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
Payment & Security
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